Error message on Cart to tell user that Vendor is Blocked

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Hello Guru's.

Please can one enlighten me as to what system changes we need to make so that Error message on Cart creation is displayed to tell user that Vendor is Blocked. Our process is that Vendor will contintue to be blocked in R/3 at Purch Org level, but with block code 01 in R/3 t-code xk05. Would a new block code specific to a Purchasing Req be required in R3?